DESENVOLVIMENTO DE METODOLOGIA ANALITICA POR CROMATOGRAFIA/ESPECTROMETRIA DE MASSAS PARA AVALIAÇÃO DA OCORRÊNCIA DE PERTURBADORES ENDÓCRINOS EM MANANCIAIS DE ABASTECIMENTO DA REGIÃO METROPOLITANA DE BELO HORIZONTE

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Some organic molecules classified as endocrine disrupters compounds (EDC) have been found in surface waters and attracted attention from the scientific community due to their hability to tamper with the endocrine system of aquatic fauna, hence due to the potential risk they pose to human health. Among the compunds with endocrine properties, the hormones (17β-estradiol 17α- ethinylestradiol) and a by-product of the degradation of non-ionic surfactants (n-nonylphenol) are of particular importance. There are a handful of papers on the monitoring of EDC in Brazilian waters and there is no Brazilian legislation regulating estradiol and nonylphenol in surface or drinking water. Therefore, this work aimed at developing analytical techniques to quantify 17 β- estradiol (E2), 17 α-ethynilestradiol (EE2) and n-nonylphenol (NP) in samples of surface water from three manancials located in the Belo Horizonte Metropolitan Area, Minas Gerais, Brazil. The quantification of such EDC was performed by liquid chromatography coupled to mass spectrometry (LCMS) after the samples being extracted and concentrated with C18 cartridges. The recovery of EDC by solid phase extraction varied from 90 to 96% and the limit of detection of the whole analytical procedure was determined as 1.4; 0.9 and 4.9 ng.L-1 for E2, EE2 and NP, respectively. After the method validation it was carried out a one year monitoring of raw and filtered water (sand filtration) of three water treatment plants (Morro Redondo, Vargem das Flores and Rio das Velhas) that supply Belo Horizonte Metropolitan Area. The results showed that the three compounds were found in at least one sample, and that the nnonylphenol was present in all water samples analysed, in a concentration range of 44 to 1,918 ng.L-1. The estrogens 17β-estradiol and 17 α-ethinylestradiol were detected in only 15% of the samples, in a concentration range of 2 to 54 ng/L. The analyses of samples collected in the WTPs after the sand filter indicates that the pre-chlorination, coagulation, sedimentation and sand filtration steps were not capable of completely removing the EDC present in the raw water.

ASSUNTO(S)

water quality mass spectrometry microcontaminantes orgânicos endocrine disruptors compounds qualidade da água tratamento de água saneamento ambiental espectrometria de massas. water treatment organic microcontaminants perturbadores endócrinos

ACESSO AO ARTIGO

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